Olivia Newton-John’s ex-boyfriend who went missing a decade ago may be alive — and hopelessly devoted to another woman.

Patrick McDermott, who disappeared from a 2005 overnight fishing trip in California and was believed to be dead, is secretly living with a German national in Mexico, according to Australia’s Woman’s Day.

“I spoke to people there. The girl he was traveling with was described as having a German accent,” investigator John Nazarian told the mag.

McDermott, who was 48 at the time and had been dating the “Grease” actress for nine years, allegedly fell off a 20-person fishing boat in 2005. Newton-John reported him missing a week later.